Update git submodules

* Update docs/submodules/releng from branch 'master'
  to f16b81e1240fba7e98a72981d160f1838d82918d
  - Merge "Publish xtestingci qcow2"
  - Publish xtestingci qcow2

    Change-Id: I8a9815c4a7cd2b033ad58e7c0e0724c43292841b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8f42179..f16b81e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8f421799c07dc1957fdd23dd8c355ec1ccf65642
+Subproject commit f16b81e1240fba7e98a72981d160f1838d82918d